package swing.samples.java2sdotcom.label;
/**   
 * @Title: LabelDemo.java
 * @Description: TODO(添加描述)
 * @author H819
 * @date 2010-10-4 
 * @version V1.0   
 */
import java.awt.GridLayout;

import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;

/*
 * LabelDemo.java needs one other file: images/middle.gif
 */
public class LabelDemo extends JPanel {
  public LabelDemo() {
    super(new GridLayout(3, 1)); // 3 rows, 1 column
    JLabel label1, label2, label3;

    ImageIcon icon = createImageIcon("images/middle.gif",
        "a pretty but meaningless splat");

    // Create the first label.
    label1 = new JLabel("Image and Text", icon, JLabel.CENTER);
    // Set the position of its text, relative to its icon:
    label1.setVerticalTextPosition(JLabel.BOTTOM);
    label1.setHorizontalTextPosition(JLabel.CENTER);

    // Create the other labels.
    label2 = new JLabel("Text-Only Label");
    label3 = new JLabel(icon);

    // Create tool tips, for the heck of it.
    label1.setToolTipText("A label containing both image and text");
    label2.setToolTipText("A label containing only text");
    label3.setToolTipText("A label containing only an image");

    // Add the labels.
    add(label1);
    add(label2);
    add(label3);
  }

  /** Returns an ImageIcon, or null if the path was invalid. */
  protected static ImageIcon createImageIcon(String path, String description) {
    java.net.URL imgURL = LabelDemo.class.getResource(path);
    if (imgURL != null) {
      return new ImageIcon(imgURL, description);
    } else {
      System.err.println("Couldn't find file: " + path);
      return null;
    }
  }

  /**
   * Create the GUI and show it. For thread safety, this method should be
   * invoked from the event dispatch thread.
   */
  private static void createAndShowGUI() {
    // Create and set up the window.
    JFrame frame = new JFrame("LabelDemo");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    // Add content to the window.
    frame.add(new LabelDemo());

    // Display the window.
    frame.pack();
    frame.setVisible(true);
  }

  public static void main(String[] args) {
    // Schedule a job for the event dispatch thread:
    // creating and showing this application's GUI.
    SwingUtilities.invokeLater(new Runnable() {
      public void run() {
        // Turn off metal's use of bold fonts
        UIManager.put("swing.boldMetal", Boolean.FALSE);

        createAndShowGUI();
      }
    });
  }
}
